You can do chat with any online user. I connect two online user.When two online user connected threw app then they can do message chatting. when user do login then they can see their previous messages. if any online user is not available or all online user are paired then new online user are waiting to connect other available user.If two user are connected and one user logout then other user available to join other new user.

$ npm install
$ react-native run-android
$ react-native start